Device for drawing parallel lines



Au 19 1192 56 gmg gm G. DERAMQ DEVICE FOR DRAWING PARALLEL LIEIES Filed April 6. 1923 Egg 22 ci & '-\w"" AYTTC /Q Y Patented Aug. 19, 1924.

UNITED STATES PATENT OFFICE.

GIUSEPPE DER-AMO, 0F ROME, ITALY.

DEVICE FOR DRAWING PARALLEL LINES.

Application filed April 6,

To all whom it may concern:

Be it known that I, Grosnrrn DERAMo, mechanical engineer, a sub ect of the King of Italy,

and residing at Rome, Italy (whose post-office address is Via Galilei 27, Rome,

Italy), have invented certain new tul Improvements in Parallel Lines, specification.

The present invention comprises for drawing parallel and use- Devices for Drawing of which the following is a a device lines composed of two small squares one sliding along the other provided with a slide and a nonius, keeplng the equal dlstance between allel lines the slide the parto be drawn, the nonius measurwith micrometric approximation the relative shifting of one square respecting the other.

The invention is especially advantageous for hatching drawing it being po ssible by means of the slide and nonius to have parallel lines equally distant and at tance required one from the other.

the dis- T he device is illustrated as an example in the accompanying Fig. 1 is a plan tion on line 1-1; 2-2.

In the figures:

Fig. 3 is a sectio drawings in which: v1ew; Fig. 2 shows a secn on line a-b are two squares of convenient material as ebonite, wood, celluloid, metal alloys and the like,

each being preferably an isosceles triangle, both being disposed in such a way that a cathetus of square :79: may slide on the hypothenuse of square :a:

The cathetus of square :2): hypothenuse of and the square :04: are broken away for a considerable length along the meeting edge thereof so as to form on each side a tooth-like abutment :e: the displacement of both squares on On the square :a:

limiting one mole.

there is fixed a dove tailed guide :0: on which a slide :d: is displaceable parallel to the hypothenuse (Fig. 2) a pressure screw through the slot :f: in the slide cures the slide to the square :a:

passes :cl: se- (Fig. 3)

The end of slide d: near the opening :f:

has a projection :g: abutment for the square :b:.

forming the second The two 1923. Serial No. 630,312.

squares then are displaceable with respect to each other between the two abutments :6: and :g: for the extent determined by the regulation of slide :cZ:, this slide being provided the divisions of a graduation may with a cut, through which be seen,

and with an index and nonius on the edge of said out, the nonius serving to regulate the position of the slide with respect to the graduation or to indicate such position.

Vhen parallel lines are to be drawn at a settled distance with the greatest accuracy, slide :d: is moved to the distance required then it is fixed by means of the screw :h:, the square :6: being afterwards shifted till it is stopped by tion pressure proj ec- Nheii parallel lines at equal settled distance are to be drawn in cm. or mm. tions of mm. or in lnches or fractions of or fracinches the device is disposed as illustrated :a: is lowered till the slot :6: i

in Fig. 1. After drawing the line the square s in correspondence with the slot of square :b:;

then square :6: is lowered until it is be contained in th The slide may be provided of one square with respect to be difierent as well as one of e hollow out any er on a millimeter graduation being sufficient.

Having now partlcularly described and ascertained the nature of my said invention and in what manner the same is to be performed I declare that what I claim A device for accurate drawing parallel lines at an equal given distance with micrometric approximation consisting in the combination of two squares of any suitable material disposed with the oathetus o t square :2): slidable along the hypothenuse of square :a:, pothenuse of the square :a nally slotted slide having a guiding visions thereon, said slide being pro one end with a projection extending path of the other square and limi a graduated guide on the hya longitudimounted on the guide and line and nonius subdivided at into the ting the movement of the latter, and a thumb screW In testimony whereof I have hereunto passing through the slot and securing the signed my name in the presence of two Wit- I slide to the square, the squares being pronesses.

Vided With abutments :0: fixing the relative position When coinciding With the Zero GIUSEPPE DERAMO. of a nonius 0n the slide :(Z:, the gradua- Witnesses:

tions of guide and slide being in millimeters BORTOLUZZI TOMMAsA,

and in inches.

PERROLLA DONATO. 

